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July 9, 1935. H. O. FLETCHER MILLING MACHINE Filed July 5, 1934 lO Sheets-Sheet l /NvE/v TOR:

July 9, 1935.. H. o. FLETCHER MILLING MACHINE lO Sheets-Sheet 2 Filed July 5, 1934 VVE/VTC) R" July 9, 1935. H, o. FLETCHER MILLING MACHINE Filed July 5, 1934 l0 Sheets-Sheet 3 July 9, 1935. H, o. FLETCHER 2,007,827

flVIIJ- JIIG MACHINE Filed July 5, 1934 lO SheetS-Sheet-4 July 9,1935. H. o. FLETCHER 2,007,827

MILLING MACHINE Filled July 5, 1954 l0 Sheets-Sheet 5 #WEA/TOR 4July 9, 1935. H. o. FLETCHER MILLING MACHINE Filed July 5, 1954 lO Sheets-Sheet 6 /NVNTORI H. O. FLETCHER MILLING MACHINE July 9, .1935.

Filed July 5, 1934 10 Sheets-Sheet '7 July 9, 1935. H. o. FLETCHER MILLING MACHINE Filed July 5, 1954 10 Sheets-Sheet 8 E. .SM E.

Q N R2 /NVENTR JKM? July 9, 1935. H; o. FLETCHER 2,007,827

MILLING MACHINE File/c1r July 5, 1934 l0 Sheets-Sheet 9 H. o. FLETCHER 2007,82?

MILLING MACHINE Filed Ju'ly s, 1954 1o sheets-sheet 1o July 9 1935'.

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Patented July 9, 1935 aoo'zgizvflf` MILLING MACH'INI.;l Henry 0. Fletcher, Manchester, VN. Application July 5, 1934, seri-aint., "1,3"33135',`

16 claims. (orso-154)] l My invention relates to milling machines, and more especially to the semi-automatic type, in which the work is held by an intermittently movable Work' holder, the only requirement of the operator being to remove the finished work and clamp a new piece of work in place for operation thereon while the machine is in operation. i y

The feeding movement is eiected by hydraulic means, provision being made for extremely fine, and wide, adjustment which may be quickly and easily accomplished.

The movements of the cutter, and the locking and index movements of the lturret are also effected by hydraulic means, in a manner that prevents any tendency of turret rotation until the cutter is entirely free from interference with the moving parts, and the turret locking device has acted to free theturret. This is accomplished by controlling the turret lock by the movements of the cutter, which will hereinafter beexplained.

One object of my invention is to, as much as possible', relieve the operator from attention to the operation of the machine. Another object is to provide a wide range `of feeds and speeds to meet the requirements of various up to date materials used in the manufacture of machine parts and cutters. Another object is to provide a constant, and even, pressure on the cutters while they are operating on the work, thus preventing vibration, and insuring accuracy and better quality of work.

Other objects are to conserve power, reduce vibration, noise, and wear of parts, cheapen and facilitate manufacture, guard against accidents, increase speed, and facilitate operation.

In the drawings Fig. 1 is a side elevation of one embodiment of my invention with cover plates removed, and parts broken away, tol reveal as much of the mechanism as possible.

Fig. 2 is a plan view looking on the top of Fig. 1.

Fig. 3 is an end elevation looking from the right of Fig. l.

Figs. 4 and 5 are sectional side elevations respectively, showing the manner of operating the vertical slide.

Fig. 6 is a diagrammaticalview illustrating the 'hydraulic system of operation.

Figs. 7 and 8 are sectional fragmental views showing the manner of connecting and disconnecting the turret rotating device.

Fig. 9 is a sectional plan View of the combination turret locking motor, showing the turret locked.

Fig. 10 is a .front sectionalelevation,taken on line itl-l of Fig. 2, showing the cutter driving and raising mechanism. i f i Figs. 11, 12, 15 and=17 aresectional side elevations, and Figs. 1314, 16, and 18 are sectional end elevations of the control valve, showingit in the various positions of itsioperation. c

Figs. 19 to 22 are side elevations showing'the trip blocks and lever for actuating the` control valve when horizontal feed is used.

Fig. 23 is a fragmental section of the turret motor cylinder wall showing the form `of exhaust port. l. l 9

Fig. 24 is a diagrammatical View showing the hydraulic system used when the'operation requires a downwardly feeding movement of the cutters. i

Figs. 25 to 28 are side elevations showing the trip blocks, and lever operation for actuating the control valve when a down feed of the cutter is required.

Fig. 29 is a sectional View taken on line 29-29 of Fig. 24. Fig. 30 is a side elevation oi' another embodiment of my invention. v

Fig. 31 is a plan view, and Fig. 32 is an end elevation of the same looking from the left of A Fig. 30.

Figs. 33 and 35 are plan views, and Figs. 34 and 36 are side elevations, respectively, of the tripping mechanism employed in the embodiment shown in Figs. to 32.

Fig. 37 is a diagrammatical view showing the hydraulic connections used in Figs. 30, 3l and 32. Figs. 38 and 39 are sectional views of the hydraulic motor for rotating the turret, showing the manner of opening and closing the intake port.

Fig. 40 is a plan view of the valve controlling the intake of the hydraulic motor for reciprocating the turret.

Referring to the drawings the motor l is mount ed within base 2, and drives the constant pressure, varying volume, hydraulic pump which takes fluid from tank t through suction pipe 5, and delivers the luidunder pressure through pipe 6, to valve l, which in vturn distributes it to the various hydraulic motors.

The carriage, or slide, 8 reciprocates in Ways El, formed in table l0, and is propelled by piston ll of hydraulic motor cylinder l2. Cylinder l2 is mounted rigidly on yoke 12a which is securely fastened to table Hl. The slide i3, to A.which cutters i5 are attached, reciprocates on ways ill, formed on carriage 8, and serves to raise the cutters to clear the work, while the work-holding turret 85 rotates to present a new piece of work for operation thereon.

Hydraulic motor I6 is attached to carriage 8, and serves to raise and lower slide I3 by means of piston I1 and rod I8.

The reducing unit I9 is driven by motor I, and drives the bevel pinion 20 by means of upright shaft 2|. Bevel gear 22 is integral with clutch driving member 24 and meshes with pinion 20. The clutch driving member 24, is freely mounted on shaft 23, and is adapted to engage driven member 25 faston shaft 23. Pinion 26 is also fast on shaft 23, and gear 21, fast on shaft 28 meshes with pinion 26.

The valve rotor 29 is fast on shaft 28, and intermittently rotates with shaft 28. The clutch 24, may be of any standard type, the one shown consisting of the well known type controlled by a cage, and engages automatically upon releasing the lug 30, and disengages when lug 30 is engaged by either of the levers 3| or 32.

Levers 3| and 32 are fast on shaft 34, and levers 32 and 35 are fast on shaft 36. The spring 31 tends to draw the upper arms of lever 3| and lever 32 together, and to hold lugs 38 and 39, formed on levers 3| and 32, respectively, inthe path of clutch lug 36. The pins 4I) engage the lower ends of lever 3| and 32, limiting their movement, to prevent interference with the clutch by lugs 38 and 39.

The trip rod 4| slides in bearings 42, and carries collars 43. 44, 45 and 46 fast thereon. Levers 33 and 35 are forked at their lower ends through which the rod 4I passes, and are engaged by collars 46 and 45, respectively. When rod 4I slides to the left (Fig. 1) collar 46 engages lever 33, rotating it, together with shaft 34 and lever 3| clockwise, releasing lug 38 from contact with clutch lug 38, thus engaging the clutch, which rotates driven member 25 and pinion 26, anticlockwise, half a revolution. As the ratio of gear 21 to pinion 26 is four to one, the shaft 28 and valve rotor 29 will rotate clockwise one eighth of a revolution.

When rod 4I slides to the right collar 45 engages lever 35 thus disengaging'lug 39 from clutch lug 30 and thereby again rotating valve rotor 29.

The lever 41, fast on shaft 48, is forked at its lower end straddling rod 4I, and engages collar 43 when moved to the left, and collar 44 when moved to the right. The lever 49, on which rolls 50 and 5I are mounted, is also fast on shaft 48.

The plate 52 (Figs. 1, 19, 20,21 and 22), is fast on slide I3, and partakes of the various movements of slide I3, and carriage 8. Trip blocks 53 and 54 are fastened to plate 52, adjustably or stationary as desired, and are adapted to engage rolls 50 and 5I as will be presently explained.

The movements of cutter I are as follows: With slide I3 lowered the carriage 8 is fed slowly forward while the cutters are performing the desired operation on the work 55, (in the case shown the cutters trim the two ends of the work piece 55) until block 54 engages roll 5I, (Fig. 19) turning lever 49, shaft 48 and lever 41 clockwise into the position shown in Fig. 19. This movement slides rod 4I to the left, and results in turning rotor 29 one eighth revolution as previously described.

Valve rotor 29 is timed so that this movement places it in the position shown in Figs. 1l and 14. The fluid enters from pipe 6, passes through passage 56, formed in valve body 1, passage 51, in rotor 29, pipe 58, hollow piston rod 59, holes 60 in piston rod 59, cylinder 6I, pipe 62, to the lower end of motor cylinder I6, raising piston I1 and rod I8, thus raising slide I3 by means of lug 63, formed on raising slide I3, to which piston rod I8 is adjustably attached by means of adjusting nuts 64 and 65.

As piston I1, and slide I3, raise the exhaust fluid flows from the upper end of cylinder I6 through pipe 66, cylinder 61, hollow piston rod 68, pipe 69, to passage in rotor 29, passage 1I in valve body 1, and exhaust pipe 12 to tank 4.

Slide I 3 raises until the cam surface 13, of block 54, engages roll 50, as shown in Fig. 20, turning lever 49 anticlockwise and engaging the clutch 25 to turn the valve rotor 29, into the position shown in Figs. and 16. The fluid enters through pipe 6, passes through passage 56, passage 13, pipe 14 to the left hand end of cylinder I2, forcing piston II to the right. (Figs. 1 and 6.) Piston I| is fastened to carriage 8 as shown, and this movement draws carriage 8 to the right retracting cutter I5 from work 55. During this movement the exhaust fluid passes from the right end of cylinder I2 through pipes 15 and 15a, passage 16, pipe 12 to tank 4.

As carriage 8 retracts to the end of its movement. block 53 engages roll 50, turning lever 49 into the position shown in Fig. 21, and slides rod 4I to the left thus causing rotor 29 to assume the position shown in the Figs. 17 and 18. The fluid enters through pipe 6, flows through passage 56. passage 51, pipe 69, rod 68, cylinder 61, pipe 66, to upper end of cylinder I6 lowering slide I3, and cutters 55, until the adjusting nut 11 engages the yoke 18; the exhaust flowing from the lower end of cylinder I6 through pipe 62, cylinder 6I, rod 59, pipe 58, passage 10, passage 1I, pipe 12 to tank 4.

As slide I3 lowers toward the end of its movement the cam surface 19, of block 53, engages roll 5I to turn lever 49 anticlockwise as shown in Fig. 22, which slides rod 4I to the right and resulting in rotor 29 assuming the position shown in Figs. 12 and 13.

The fluid enters from pipe 6 flowing through passages 56 and 16 and pipe 15, to right end of cylinder I2, to force piston II and carriage 8 to the left, and feeds the cutters 55 forward to perform their operation cn a new piece of work.

The small passages IIJI, |02, |63 and |04, formed in valve body 1 are for the purpose of keeping up the pressure in cylinder' I6 after valve rotor 29 has operated to supply fluid to cylinder I2.

Cylinder 6I and 61 are attached to carriage 8, and partake of the movement thereof; and hollow pistons 59 and 68 are held stationary by bear ings 59a and 68a, respectively, attached to the stationary yoke I2a, so that these pistons and cylinders form telescoping joints to supply fluid to the moving motor I6 from a stationary source, the small passages IIJI to |04 allowing fluid to flow into, or out of, cylinders 6I and 61 even after valve rotor 29 has operated to supply fluid to cylinder I2.

1t will be seen that the pressure exerted in cylinders 6| and 6l tend to help, rather than hinder,

the movement of carriage 8 as it is reciprocated in either direction by motor I2.

Referring more especially to Figs. l to 3 and 6 to 9, it will be noticed that pipe 8l) leads from pipe 15a to the rear end of turret locking motor 8|, and that pipe 82 leads from 14 to the front end of motor 8|, so that when valve 1 delivers fluid through pipe 14 to the left hand end of cylinder I2 to retract carriage 8, uid also flows through pipe 82, to force piston` 83 and lock rod 84 away from turret 85, withdrawing rod 85 from the tapered hole I I0 in turret 85, thus allowing free rotation thereof.

Collars 86 and 81 are rast on the rear end 88, of rod 84, and lever 89 fulcrumed at 90 in bracket 9| is forked at its upper end straddling rod 88, the

pins 92 extending inwardly from the two prongs thereof, and between collars 86 and 81, are ,engagcd thereby to impart movement to lever 89 as piston 83 is impelled in either direction. The connecting rod 93, pivotally connected, at one end, to the lower end of lever 89, and at the other end to rack 94 serves to reciprocate rack 94 as lever 89 is rotated on fulcrum 90 by the move-` ment of piston 83. Rack 94 meshes with segment 95, which is loosely mounted on the cylindrical shaped rack 96, and is held from partaking of the sliding movement of rack 96 in either direction by bearing 91, which also serves as a bearing for racks 94 and 96.

Rack 96 is attached to piston 9.8, which reciprocates in motor cylinder 99, and meshes with gear |00, fast on turret spindle |05, serving to rotate turret, or work table 85, when fluid pressure is applied to the piston end of cylinder 99, which will hereinafter be explained.

When valve 1 delivers uid to cylinder I 2 to advance carriage 8 toward turret 85, the fluid is also delivered, through pipe 80, to the rear end of motor cylinder 8|, thus forcing the lock bolt 84 into one of the tapered holes IIO in turret to firmly hold the same from movement while the cutters I5 are operating on work 55. Segment 95 is tted to the contour of rack 96 so that, during the movement o f piston 83, to lock turret 85, it will be seen that the resulting movement of lever 89, and rack 94, will rotate segment 95 and rack 96 to the position shown in Fig. 8 with the teeth of rack 96 out of mesh with gear |00. This is accomplished by providing clearance on one half the width of the teeth of rack 96. As piston 83 moves to unlock turret 85, the resulting movement of lever 89, and rack 94, rotates segment 95,

4and rack 96 to the position shown in Fig. 7, with rack 96 in mesh with gear |00, ready to rotate turret 85.

Pressure supply pipe |06 delivers uid through port |01, to cylinder 8|, and pipe |08 connects cylinder 8| with the left hand end of cylinder 99, and pipe |09 connects cylinder 8| with the right hand end of cylinder 99 as shown.

The movement of piston 83 is greater than is required to withdraw lock-bolt 84 from hole ||0, and the excess movement is utilized for connecting supply port I 01 with pipe |08 for supplying fluid to cylinder 99 to forcepiston 98 to the right; and, as previously explained, rack 96 is in mesh with gear |00 at this time, resulting in rotation of turret 85.

As piston 83 acts to lock turret 85, rack 96 is disengaged from gear |00, as previously explained, and the latter part of the movement of piston 83 connects port |01 With pipe |09 for supplying fluid under pressure to return piston 98 to its initial position. (See Fig. 9.)

Referring to Figs. 24 and 29, the lock-bolt 84 is pivotally connected, at |40, to lever |39, and lever |39 is fulcrumed, at 44| to the stationary frame work of the machine. The tapered locking wedge |42, extending to one side at the opposite end of lever |39 is adapted to fit snugly in the wedgeshaped notch |41 in turret 85. The roll |43 is pivotally mounted on lever |39, at |44, and its periphery extends beyond the end of wedge |42. This roll engages and rolls on the circular surface |45 of turret 85 and prevents locking wedge, and piston 83, advancing until turret 85 has completed its required movement. When turret 85 has completed its rotation, roll |43 is forced into the semi-circular cut |46, and wedge |42 is forced into notch |41, thus holding turret 85 firmly in position.

It will be seen by the foregoing that piston 83 cannot act to cut olf the flow of fluid to cylinder 99, to stop the rotation of turret 85, until it is completely indexed.

The port ||I in cylinder 99 is nearly closed by piston 98 as it reaches the end of its stroke, and port I II is elongated, and narrowed at the far end of the stroke, (see Fig. 23), so that the exhaust is gradually choked as the piston 98 nears the end of its movement, resulting in decelerating the movement of piston 98, and turret 85, at this time, thus bringing turret 85 to a gradual stop.

The pipe ||2, connects pipe |09 to the extreme right end of the cylinder 99, and check valve |2a prevents the now of the fluid from cylinder 99 to pipe |09, through pipe I I2, but allows free flow of fluid in the opposite direction, to start piston 98 on its movement to the left.

When piston 98 moves to the right fluid flows from the right end of the cylinder 99, through pipe |09, and exhaust pipe I3, to tank 4. When piston 98 moves to the left, fluid ows from the left end of cylinder 99 through pipes |08 and |I3 to tank 4.

From the foregoing it will be seen that it is impossible for the turret lock to act to unlock the turret until the cutters have been raised to clear the work and that the turret can not be rotated until the locking bolt is entirely Withdrawn to allow free rotation of turret 85. Also that motor 99 cannot act to rotate turret 85 until rack 96 is meshed with gear |00, and that motor 99 cannot act to return piston 98, until rack 96 is disengaged from gear I 00.

The valve II4, in pipe |06, regulates the ow of fluid to motor 99; and valve |I5, in pipe 82, regulates the flow of fluid to motor 8|.

The valve IIB, in pipe 15, regulates the flow of uid to cylinder I2 While carriage 8, and cutters I5, advance toward, and While they are performing their operation on work 55. The two arm lever II1, adiustably mounted o-n the stem of valve IE6, serves to open, and partially close, valve IIB. The bar II8, adjustably fastened in bracket ||9 attached to carriage` 8, and sliding in bearing II8a, carries roll |20 which, as will be seen, partakes of the movement of carriage 8. When carriage 8 retracts from the work to the right, (Figs. l and 6), roll |20 engages arm vvI|1a of lever Ill', to open valve ||8 during the latter part of the movement of carriage 8, and holds valve I|6 open during the first part of the movement of carriage 8 to the left, as it advances the cutters I5 toward the work. thus providing a comparatively rapid movement until the cutters are about to enter the work.

.Just before cutters I5 have advanced to enter the work 55, roll |28 engages aim Il'b, of lever Ill., and turns lever I|1 to the position shown' The by-pass pipe 15a is connected at either end. to pipe 15, in a manner to allow free flow of fluid between valve 1, and cylinder I2; but the check valve interposed in pipe 15a prevents flow of fluid from valve 1 to cylinder I2, and allows free flow in the opposite direction, as indicated by the arrow. This construction only allows fluid to flow through valve I I6 while carriage 8 is advancing, but allows free flow of fluid, causing rapid retracting movement of carriage 8 in the opposite direction.

If it is desired to operate valve ||6 a little earlier, or later, relative to the movement of carriage 8, the thumb screw |22, in bracket II9, may be loosened and bar |I8 adjusted slightly to the left or right as conditions require.

Referring especially to Figs. 1, 2, 3, and 10, the motor |25 is mounted on carriage 8, and drives shaft |26. The worm |21 is fast on shaft |26, and meshes with worm gear |28, fast on upright shaft |29. The wide face gear |30, is fast on shaft |29, and meshes with gear I3I, fast on shaft |32. The worm |33 is fast on shaft |32, and meshes with worm gear |34 fast on cutter block spindle |35. The cutter block spindle drives cutter spindle I 36, on which cutters I are mounted.

The shafts |26, |29 and |32, are mounted in suitable bearings; and gears |28, |30 and |3I, are mounted in suitable housings that are supported by brackets fastened to carriage 8, and partake of the movements thereof.

The cutter block |31, carrying spindle |35, is adjustably fastened to slide I3, and reciprocates therewith, so that cutter block |31, gear |34 worm |33, shaft |32 and gear |3| are raised and lowered with slide I3; the teeth of gear |3| sliding on teeth of gear |30. This climinates the use of sliding and universal joints in the power transmission thus assuring even speed to cutters |5, conserving power, and greatly reducing wear of parts.

The operation is as followsz-The work 55 being clamped in suitable fixtures attached to turret 85, motors I, and |25 are started which supplies fluid to the various hydraulic motors and starts cutters I5 revolving. The valve 1 supplies fluid to motor I2, causing carriage 8, and cutters I5, to advance to perform the desired operation, and to cylinder 8| to lock work table 85. Trip block 54 operates lever 49, as shown in Fig.- 19 to reset valve 1, thus discontinuing the flow of fluid to cylinder I2, and delivering fluid to cylinder I6 to raise slide I3, and cutters |5, to clear the work. As the upward movement of slide I3 is being completed, block 54 operates lever 49, as shown in Fig. 20, for resetting valve 1 to supply fluid to motor I2 to retract carriage 8, and also motor 8| for unlocking turret 85. At the latter part of the unlocking movement motor-valve 8| supplies fluid to cylinder 99 to rotate turret 85 bringing a new piece of work in position to be operated on by cutters I5 as previously described.

When carriage 8 has suillciently retracted, block 53 operates on lever 49, as shown in Fig. 2l, to cut oil" the flow of fluid to cylinder I2, 'Il'ius arresting the movement of carriage 8, and supplies fluid to cylinder IG, for lowering slide I3. When slide I3 has sufficiently lowered, block 53 acts on lever 49, as shown in Fig. 22,

.to supply fluid to cylinder I2 to again advance carriage 8, and to cylinder 8| to lock turret 85. It will be understood that. while this cycle of movements is taking place, the operator removes a finished piece of work, and clamps an unfinished piece in place for operation thereon.

Referring to Figs. 24 to 28, most of the parts employed are the same as in the views previously described, the object being to utilize the downward movement of cutters I5 for performing the operation on the work instead of the horizontal movement as previously described.

Lever 49 is operated by blocks |48, and |49 as shown in Figs. 25 to 28.

In Fig. 24 the slide I3 has just completed its upward movement, turret 85 has completed its rotation, and the inclined surface |480., of block |48 has operated lever 49, as shown in Fig. 26, to reset valve 1a for supplying fluid to the right hand end of cylinder I2, through pipe |59, to advance carriage 8, and cutters |5a. at a comparatively rapid rate. This movement causes block |49 to operate lever 49, as shown in Fig. 25, for resetting valve 1a, to supply fluid to the upper end of cylinder I6, through pipe I5I, cylinder 61 and pipe 66, to lower slide I3 and cutters 55a, and to cylinder 8|, through pipe 80. to lock cylinder 85.

The valve |53 is interposed in pipe |5I, to restrict the flow of fluid to effect the proper cutter feed for cutter I5a.

The pipe |52 is provided to allow free flow of exhaust fluid during the return movement of piston I1, the check valve |54 preventing flow of fluid except for exhaust as indicated by the arrow.

This downward feeding movement of the cutters |5a takes place from the position shown by dotted lines at |56 to position |51 in Fig. 24.

As slide I3 nears its extreme downward movement the inclined surface |49a, of block |49, operates lever 49, as shown in Fig. 2'1, to reset valve 1a for supplying fluid to the left end of cylinder I2, to retract carriage 8, and cutters |5a, through pipe |58. The valve |50 in pipe |60, regulates the flow of fluid to cylinder 8|.

When the carriage 8 has retracted sufficiently, block |48 operates lever 49 as shown in Fig. 28, to reset valve 1a for supplying fluid to the lower end of cylinder I6, through pipe 58, cylinder 6I, and pipe 62 to raise slide I3 and cutters |5a to the forward end of cylinder 8|, through pipe |60, to unlock turret 85, and to cylinder 99, through pipe |08, to rotate turret 85.

As slide I3 nears the end of its upward movement, block |48 operates upon lever 49, as shown in Fig. 26, for resetting valve 1a to supply fluid to the right hand end of cylinder I2, through pipe |59 to again advance carriage 8.

Referring to Figs.' 30 to 40, the stationary bracket |64 is rigidly fastened to table I0a. The slide I3, carrying cutters I5, reciprocates on bracket |64 in the same manner as on carriage 8.

The motor |25 drives cutters I5 in the same manner as previously described, all the driving mechanism connected therewith being identical with that shown in Figs. l, 2, 3, and 10. The valve 1 and its driving mechanism is also identical with that shown in Figs. l, 2 and Figs. 11 to 18.

The motor I, pump 3, and reducing unit I9, are the same as shown in Fig. 1 and perform the same functions.

The turret |65 is similar to turret 85; but instead of bearing |85, in which it rotates, being fastened to table I0a it is reciprocated toward and away from cutters I5. by hydraulic motor |66. The turret |65 is rotated by hydraulic motor |61. The turret lock is operated by hydraulic motor manner as lever I I1 operates valve I I6.

` to be engaged by dogs |91 and |98.

I 68, the turret locking mechanism being the same as before described.

Referring especially to Figs. 32 and 37, the piston |69 extends out through the rear end of motor |68 to which collars 86 and 81 are rigidly attached, and lever 89a fulcrumed at 90a, is operated by piston rod |69 in the same manner as lever 89 is operated by rod 84. The connecting rod 93a is pivotally connected at one end to lever 89a and at the other end to rack 94a thus operating the segment 95 in a manner similar to that shown in Figs. 7 and 8.

The segment 95 oscillates rack 96 in the same manner as shown in Figs. '7 and 8; and, as piston rod |10 is rigidly attached to rack 96, piston |10 isoscillated with rack 96. Piston rod |10 :'s integral with piston |14, which reciprocates in hydraulic motor cylinder |61 so that when rack 96 is turned into engaging position with gear |12 fast on turret spindle |13 of turret |65, turret |65 is rotated thereby. l

Piston |14 is flattened on two sides at its forward end as shown at |15; (see Figs. 37, 38 and 39), and rack 96 is engaged with gear |12 when piston |14 is at itsleft hand position, so that piston |14 rotates turret |65 during its stroke to the right, see Fig. 37. When piston |14 is at its left hand position and rack 96 is turned out of mesh with gear |12, port opening |16, in cylinder |61, is covered by piston |14, as shown in Fig. 39; but, after rack 96 has been turned into mesh with gear |12, port |16 is uncovered by the flattened portion |15, of piston |14, as shown in Fig. 38, thus delivering u'd to cylinder |61 to propel piston |14 to the right to rotate turret |65.

The rod |11 is integral with piston |14, and extends through the head |18 of cylinder |61. The collars |19 and |80 are adjustably attached to rod |11; the downwardly turned end of lever |8| extends between these collars as shown in Figs. 37 and 40. The lever |8| is fastened to valve |82 in a manner to open and close valve |82 when piston |14 reciprocates in cylinder |61. When piston |14 moves to the right to rotate turret |65, collar |19 engages lever |8| to open valve |82, and when piston |14 moves to the left collar |80 engages lever |8| to close valve |82.

The bar |83 is adjustably attached to bracket |84, which in turn is rigidly attached to turret bearing |85; The roll |86, is pivotally mounted on bar |83 and engages lever arms |81a and |81b, of lever |81, which is adjustably attached to valve |88, in the same manner as lever ||1 is attached to valve ||6 and operates valve |88 in the same (See Figs. 1 and 6.)

The piston rod |89 is integral with piston |90, which reciprocates in cylinder |66, and rod |89 is rigidly attached to turret bearing |85, which is adapted to reciprocate in ways |92 formed in table |a..

The cylinders |93 and |94 are attached to turret bearing |85, and function ln the same manner, respective to the movement of turret bearing |85, as cylinders 6| and 81, respectively function relative to the movement of carriage 8.

The trip rod 4|, collars 45 and 46, levers 3|, 32, 33, and 35, clutch members 24 and 25, pinion 26, gear 21 and valve 1 perform respectively the same functions as previously describedand shown in Figs. 1 to 3.

The trip lever |95, fast on shaft |96, is adapted Arm |950. of lever |95 is engaged by dog |98, and arm |95?) is engaged by dog |91, respectively. Dogs |91 and |98 are adjustably mounted upon plate |99 which, in turn, is attached to slide |3.

The lever 200 is also rigidly mounted on shaft |96, and is forked at its lower end to straddle rod 4|. The forked end of leverr 200 engages collar 20|, adjustably mounted on rod 4|, as shown, and is held in contact vtherewith by spring 202 fastened at one end to lever |95 and at the other end to table |0a.

When slide |3 raises dog |91 engages arm |951), rocking lever |95, shaft |96 and lever 200 clockwise, to slide rod 4| to the left; and when slide I3 lowers dog |98 engages arm |95a to again rock shaft |96, and lever 200 clockwise, and slide rod 4| to the left. (See Figs. 34 and 36.)

The trip lever 203, composed of the two arms, 203e and 203D, is fast on shaft 204, and the arms 203a, and 203D, are engaged by dogs 205 and 206, respectively, when turret |65 recedes and advances with respect to cutters i5.Y The dogs 205 and 206 are adjustably mounted on plate 201 which is rigidly fastened to turret bearing |85. Lever 208 is also fast on shaft 204, and bears at its outer end on rod 4| to slide rod 4| to the right when dog 205, or 206 engages the arms of lever 203 to rock shaft 204 anticlockwise-as shown in Figs. 33 and 35.

The action is as follows: Assuming the parts to be in the positon shown in Figs. 30 and 31, dog` 205 has engaged arm 2030. (see Fig. 35) to slide rod 4| to the right, thus operating valve 1 to supply fluid to motor I6, through pipe 209, to lower slide |3, and cutters |5, to cutting position.

As slide, I3 lowers dog |98 engages lever arm |95a to reset valve 1 for supplying fluid to motor cylinder |66 Ythrough pipe 2|0 to feed turret |65 toward cutters |5 for performing the desired operation, the lever |81 operating to control the feed in the same manner as lever ||1, shown in Figs. 1 and `6. Valve 1 also supplies fluid at this setting to supply fluid to cylinder |68 through pipe 2|| and cylinder |94 for locking turret |65, and through pipe 2|2 `to cylinder |81 to return piston |14 and rack 96, to initial position.

As turret |65 nears its forward positionwith relation to cutters |5, dog 206 engages leverarm 20327 to slide rod 4| to the right, thus resetting valve 1 for supplying fluid to cylinder I6, through pipe 2|3, to raise slide I3 and cutters |5,

When slide I3 has been raised nearly to its upward position dog |91 engages lever arm |951), to slide rod 4| to the left, resetting valve 1 for supplying fluid to cylinder |68 through pipe 2|4, cylinder |93 and pipe 2|5a to unlock turret |65,

and to cylinder |61 through pipe2l5 to rotate turret |65.

As piston |14 nears the end of its stroke valver It will be noticed that the stroke of piston |14 is not suicient to give turret 65 its complete rotation, this being completed during the retractive movement of turret |65 by the gear |12 rolling on rack 96.

The stops 2|1, firmly set on table |0a, limit the retractive movement of turret |65, and the stops 2|8, also attached to table |0a, limit the advance movement of turret |65 with precision so that rack 96 will engage gear |12 without interference; and stops 2|8 are also used to determine the exact length of the cutting operation by cutters `I5. i

The by-pass pipes 2|9 and 220, respectively,

perform the same functions as by-pass pipes 15a and |52, previously described.

The rotary valves 1 and 1a may be replaced by piston valves, and I am aware that many other changes in construction, and arrangement of parts may be resorted to without departing from the spirit and scope of my invention.

Having described my invention what I claim as new, and desire to be protected by Letters Patent is set forth in the following claims:

1. In a milling machine, a cutter, a work table, a first hydraulic motor for reciprocating one of said parts to effect relative advance and return movements between said parts in a plane parallel to said work table; a second hydraulic motor for intermittently rotating the work table; a locking device for locking the work table during said advance movement and unlocking the work table to allow free rotation thereof; a third hydraulic motor for operating the locking device; a fourth hydraulic motor for raising and lowering said cutter; a pump, and hydraulic piping system, for supplying fluid under pressure to said hydraulic motors; a valve for distributing the fluid to the first, third and fourth hydraulic motors; means operated lby the advance movement of said reciprocating part for setting the valve to supply fluid to the fourth mentioned motor to raise the cutter; means operative by the raising movement of the cutter for resetting the valve to supply uid to the first mentioned motor to return said reciprocating part, and to the third mentioned motor for unlocking the work table; means operative by the return movement of the said reciprocating part for resetting the valve to supply fluid to the fourth mentioned motor to lower the cutter; means operative by the lowering movement of the cutter for resetting the valve to supply fluid to the first mentioned motor to advance the cutter; a second valve for supplying fluid to the second mentioned motor; and means operative by the unlocking movement of the locking device for operating the second mentioned valve to supply fluid to the second mentioned motor to rotate the work table.

2. In a milling machine, a cutter, a work table, a first hydraulic motor for reciprocating one of said parts to effect relative advance and return movements between said parts in a plane parallel to the work table; a second hydraulic motor for intermittently rotating the work table; a locking device for locking the work table during the advance movement of said reciprocating part, and unlocking the work table to allow free rotation thereof; a third hydraulic motor for operating the locking device; a fourth hydraulic motor for raising and lowering said cutter; a pump, hydraulic piping system, and valve, for supplying fluid under pressure to said hydraulic motors; means operated by the advance movement of said reciprocating part for setting the valve to supply fluid to the fourth mentioned motor to raise the cutter; means operated by raising movement -of the cutter for setting the valve to supply fluid to the first mentioned motor to return said reciprocating part, to the third mentioned motor to operate the locking device for unlocking the work table, and the second mentioned motor to rotate the work table; means operated by the return movement of said reciprocating part for setting valve to supply fluid to the fourth mentioned motor to lower the cutter; and means operated by the lowering movement of the cutter for setting the valve to supply fluid to the first mentioned motor to advance said reciprocating part.

3. In a milling machine, a work table, a cutter, a hydraulic motor for reciprocating one of said parts'to effect a relative advance movement for the cutting operation, and a return movement to restore the parts to relative initial position; a pump, and hydraulic piping system, for supplying fluid under pressure to said hydraulic motor; a valve interposed in said piping system for regulating the flow of fluid to said motor; a two arm lever, the arms angularly disposed to each other, adapted to regulate said valve; and a slide, adapted to partake of the reciprocating movements -of the reciprocating part, and to engage one arm of said lever during the return movement of the reciprocating part to open said valve, and hold said valve open during the idle advance movement of the cutter toward the work, andl to engage the other arm of said lever, to partially close said valve, to reduce the flow of fluid during the cutting operation of the cutter upon the work.

4. In a milling machine, a cutter, a work table, a hydraulic motor for'reciprocating one 0f said parts to effect a relative advance movement between said parts for the cutting operation, and

a return movement to restore the parts to relative initial position; a pump, and hydraulic piping system, for supplying fluid under pressure to said motor, said piping system comprising a conduit for supplying fluid to one end of said motor to return said reciprocating part to initial position, a supply conduit to the other end of said motor to advance said reciprocating part, a valve in said second mentioned conduit to regulate the flow of fluid during said advance movement, and a by-pass, having a check valve, in the second mentioned conduit adapted to allow free flow of the exhaust fluid past said regulating valve, but to prevent the flow of fluid in the'opposite direction; and means controlled by the movement of the reciprocating part for regulating said control valve to allow free flow of fluid during the idle advance movement of the reciprocating part, and to restrict the flow of fluid during the operation of the cutter upon the work.

5. In a milling machine, a work table, a cutter carrying carriage adapted to reciprocate in a lplane parallel to the surface of the work table to produce an advance cutting movement and a return movement; a slide mounted on the carriage for raising and lowering the cutter; means for rotating the work table; a locking device for locking the work table during the operation of the cutter upon the work, and unlocking the work table to allow free rotation thereof; means operative by the advance movement of the carriage for raising the cutter; means operative by the raising movement of the cutter for returning the carriage and operating the locking device to unlock the work table; means operative by the unlocking movement of the locking device for actuating the first mentioned means to rotate the work table; means operative by the return movement of the carriage for lowering the cutter: and means operative by the lowering movement of the cutter for locking the work table and advancing the carriage.

6. In a milling machine, an intermittently rotatable work table; a cutter carrying carriage adapted to reciprocate with relation to the work table; a slide mounted on said carriage for raising and lowering the cutter; a locking device adapted to lock the work table during the operation of the cutter upon the work and unlocking it to allow free rotation thereof; a clutch adapted to be intermittently engaged for actuating' mechanisms to reciprocate the carriage, and operate the slide and locking device; means operated by the advance movement of the carriage for engaging the clutch to actuate mechanism for raising the slide; means operated by the raising movement of the slide for engaging the clutch to actuate mechanism for unlocking the work table and returning the carriage; means operated by the unlocking movement of the locking device for rotating the turret; means operated by the return movement of the carriage for engaging the clutch to actuate mechanism for lowering the slide; means operated by the lowering movement of the slide to engage the clutch to actuate mechanism for advancing the carriage and lock the work table.

7. In avmilling machine, an intermittently rotating work table, a cutter carrying carriage adapted to reciprocate in a plane parallel to the work table; a slide mounted on the carriage for raising and lowering the cutter; a locking device for locking the work table, during the operation.

of the cutter upon the work, and unlocking the work table to allow free rotation thereof; a rst hydraulic motor for reciprocating the carriage;

a second hydraulic motor for raising and lower-' tributing the fluid to the first, second and third motors; means operated by the advance .movement of the carriage for setting the valve to supply fluid to the second motor to raisethe slide; means operated by the raising movement of the slide for resetting the valve to supply fiuid to the iirst motor to return the carriage, and to the third motor to unlock the work table; means operated by the return movement of the carriage for resetting the valve to lower the slide; means operated by the lowering movement of the slide for resetting the valve to supply uid to the third motor to lock the Work table, and to the first motor to advance the carriage; a second valve for controlling the flow of fluid to the fourth motor; and means operated by the unlocking movement of the locking device for setting the second mentioned valve to supply iluid to the fourth motor to rotate the work table.

8. In a milling machine, an intermittently revolvable work table, a cutter, means to reciprocate the work table relative to the cutter to produce an advance cutting movement and ,a return movement; a slide for raising and lowering the cutter; a first hydraulic motor( for reciprocating the work table; a second hydraulic mo-` tor for rotating the work table; a third hydraulic motor for raising andlowering the slide; a locking device for locking the work table against rotation during the operation of the Work by the cutterV and unlocking thework table to allow free rotation thereof; a fourth hydraulic motor for operating the locking device; a pump, and hydraulic piping system lfor supplying iiuid under pressure to said motors; a valve interposed in said piping system for distributing the fluid to said motors; means operated by the advance movement of the work table for setting the valve to supply fluid to the third motor to raise the slide; means operated by the raising movement of the slide for resetting the valve to supplyfluid to the fourth motor to unlock the work table, to the second motor to rotate the work table, and to the first motor to return the work table; means operated by the return movement of the Work table for resetting the valve to supply fluid to the third motor to lower the slide; means operated by the lowering movement of the slide for resetting the valve to supply uid to the fourth motor to lock the work table, and to the rst motor to advance the work table.

9. In a milling machine, a work table, a cutter, a hydraulic motor for reciprocating one of said parts to eifect a relative advance movement for the cutting operation, and a return movement to restore the parts to relative initial position; a pump, and hydraulic piping system, for supplying fluid under pressure to said hydraulic motor; a valve interposed in said piping system for regulating the flow of fluid to said motor; a two arm lever, the arms angularly disposed to each other, adapted to regulate said valve, a slide, adapted to partake of the reciprocating movements of the reciprocating part, and to engage one arm of said lever arms during the return movement of the reciprocating part to open said valve, and hold said valve open during the idleadvance movement of the cutter toward the work, and to engage the other arm of said lever, to partially close said valve, to reduce the flow of fluid during the cutting operation of the cutter upon the Work;

and means to adjust said lever relative to said regulating valve.

10. In a machine tool having an intermittently rotatable work holder, a cutter having reciprocable movements with relation to the work holder, a hydraulic motor having a piston connected to a rack adapted to be engaged with and disengaged from a gear fixed to said work holder, a locking device for locking the work holder between rotations and unlocking the work holder to allow free rotation thereof, `means operable by the locking movement of the locking device to disengage the rackV from the gear, and means operable by said unlocking movement to engage the rack with the gear and supply fluid under pressure to said motor to rotate the work holder.

11. In a machine of the class described having an intermittently rotatable Work holder, and a cutter adapted to have relative reciprocable movement with relation to the work holder, a hydraulically operated motor for rotating the work holder, means forsupplying uid under pressure to said motor, a locking device for locking and unlocking the work holder, means operable by the locking device for connecting the motor with and disconnecting the motor from the, work' holder and to control fluid under pressure for operating said motor.

12. In a machine tool, a rotatable' work-holder,

a cutter having a relative reciprocating movement l 'lli motor, and means to retard the movement of the motor during the latter part of the rotation of the work-holder by gradually restricting the iiow j of the fluid thus bringing the Work-holder to a gradual stop. i

13, In a machine tool having a cutter and a work holder, means including a hydraulic motor for reciprocating one of said parts for performing a cutting operation upon the work and returning said part to initial position, a pipe line for supplying uid under pressure to one end of the motor for advancing said reciprocating part, a pipe line for supplying iiuid to the other end of the motor for returning said part, a valve in the rst mentioned pipe line, a by-pass having a check valve in the rst mentioned line for allowing ow of exhaust fluid only by said valve, means controlled by the movement of the reciprocating part for opening said valve during said return movement and maintaining it open during the idle advance movement of the cutter, and for maintaining the valve partially closed during the operation of the cutter upon the work.

14. In a milling machine a Work-holder and a cutter having relative reciprocatory movement with relation to each other in a rst path to relatively advance one of said parts to perform a cutting operation on the work and-to restore the parts to relative initial position, a first hydraulic motor for reciprocating the reciprocating part, means including a second hydraulic motor for moving the cutter in a second path to clear the work during the restoring movement of the reciprocating part and returning the cutter to operative position, means including a valve for distributing fluid under pressure to the motors, means operative by the movement of the reciprocating part during the cutting operation for setting the valve for supplying iiuid to the second motor to move the cutter in the second path to clear the work, means operable by the clearing movement of the cutter for resetting the valve to supply huid to the first motor for restoring the reciprocating part to initial position, means operable by the restoring movement of the reciprocating part for resetting the valve for supplying fluid to the second motor to return the cutter to operative position, means operable by the return movement of the cutter to operative position for resetting the valve to supply fluid to the rst motor to advance the reciprocating part, adjustable stops for positioning the cutter at each end of its movements in the second path, and means to retain pressure in the second motor to hold the cutter with rigidity at the end of its movements in the second path by reason of said continued pressure working against said stops during the succeeding movements of the reciprocating part.

15. In a machine tool a cutter and a work holder, means to reciprocate one of said parts to effect a relative advance movement for the cutting operation and a retractive movement for returning the reciprocating part; a source of fluid pressure for said motor; a f1rst pipe line leading from said source to one end of said motor for supplying fluid to advance said reciprocating part, and a second pipe line leading from said source to the other end of said motor for retracting said reciprocating part; a valve in said first line for regulating the flow of the uid to said motor; a lever adapted to open and partially close said valve; a'nd means operative by the movement of the reciprocating part to operate the lever to open the valve during said retractive movement and to retain the valve in open position during the idle advance movement of the reciprocating part, and to partially close the valve to restrict the ow of fluid to said motor during the cutting operation.

16. In a device of the class described, a work holding element and a cutter holding element; means to reciprocate one of said elements, relative to the other in a first path, to effect an advance cutting movement and return the reciprocating element to initial position; an intermittently rotatable turret mounted on the work holding element, having a plurality of fixtures for holding, and carrying, the work from one station to another as the turret rotates; a cutter carrying slide for retracting the cutter, in a second path, to clear the work during the turret rotation, and restoring the cutter to the plane of operation; a turret lock for locking the turret rmly in position, during the cutting operation, and unlocking it to allow free rotation thereof; means, operable by the advance movement of the reciprocating element, for retracting the slide; means, operable by the retractive movement of the slide, to unlock the turret and return the reciprocating element to initial position; means, operable by the unlocking movement of the turret lock, to rotate the turret; means, operable by the return movement of the reciprocating element, for restoring the cutter to the plane of operation; and means, operative by the restoring movement of the cutter, for locking the turret and advancing the reciprocating element.

HENRY O. FLETCHER. 

